Low-Noise Matched
Transistor Array ICs THAT 300 Series
FEATURES APPLICATIONS • 4 Matched NPN Transistors • Low Noise Front Ends º 300 typical hfe of 100
º 300A minimum hfe of 150
º 300B minimum hfe of 300 • Microphone Preamplifiers • 4 Matched PNP Transistors
º 320 typical hfe of 75 • 2 Matched PNP and 2 Matched NPN
Transistors • Log/Antilog Amplifiers º 340 PNP typical hfe of 75
º 340 NPN typical hfe of 100 • Low Voltage Noise • Current Sources º 0.75 nV/ √Hz (PNP)
º 0.8 nV/ √Hz (NPN) • High Speed • Current Mirrors º fT = 350 MHz (NPN)
º fT = 325 MHz (PNP) • 500 μV matching between devices
• Dielectrically Isolated for low crosstalk
and high DC isolation
• 36V VCEO • Multipliers Description
The THAT 300, 320 and 340 are large
geometry, 4-transistor, monolithic NPN and/or PNP
arrays. They exhibit both high speed and low noise,
with excellent parameter matching between transistors of the same gender. Typical base-spreading
resistance is 25 Ω for the PNP devices (30 Ω for the
low-gain NPNs), so their resulting voltage noise is
under 1 nV/√Hz. This makes the 300 series ideally
suited for low-noise amplifier input stages, log amplifiers, and many other applications. The four-NPN
transistor array is available in versions selected for
hfe with minimums of 150 (300A) or 300 (300B). …